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Dry scrubber system

Active Publication Date: 2013-11-07
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes an air quality control system that uses a CDS DFGD system and a fabric filter module to treat flue gas for the removal of sulfur dioxide, and like particulate and gaseous pollutants therefrom. The system operates using an aqueous reducing agent slurry, such as lime, which has lower capital investment requirements and associated operating costs compared to traditional systems. The use of an aqueous reducing agent slurry in the CDS DFGD system and fabric filter module provides increased turn down capability, reduced energy consumption, and increased reliability and operating flexibility compared to traditional systems. The present invention addresses the need for replacement of equipment in air quality control systems and the use of an aqueous reducing agent slurry in the CDS DFGD system and fabric filter module increases efficiency and flexibility while reducing costs.

Problems solved by technology

However, as with all plant equipment, after a period of time the equipment becomes worn and replacement becomes necessary.

Method used

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Examples

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Embodiment Construction

[0014]One embodiment, generally depicted in FIG. 1 as a process schematic diagram that includes a boiler 2, an air quality control system (AQCS) 4 and a stack 9. It is noted that many additional and varied process steps using additional equipment may be positioned or take place between boiler 2 and AQCS 4, as is known to those skilled in the art. Likewise, many additional and varied process steps using additional equipment may be positioned or take place following AQCS 4 and prior to environmental release of a “cleaned” flue gas, CG, from stack 9, as is known to those skilled in the art. Such additional process steps and / or equipment are not described in further detail herein for purposes of clarity and simplicity.

[0015]As noted previously, FIG. 1 illustrates schematically an AQCS 4 for cleaning dirty flue gases, FG, from a plant 1 conducting a combustion process, such as those from a fossil fuel-fired or coal-fired boiler 2. The hot flue gases containing SO2, SO3, HCl, HF, fly ash ...

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Abstract

An air quality control system (AQCS) useful for processing a gas stream, such as a flue gas stream emitted from a fossil fuel fired boiler, for at least partial removal of acidic and like pollutants therefrom. The air quality control system includes a CDS reactor useful using a reducing agent slurry.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61 / 643,432; filed on May 7, 2012, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention is generally directed to an air quality control system (AQCS) useful for processing a gas stream, such as a flue gas stream emitted from a fossil fuel fired boiler, a combustion process or the like. More particularly, the present invention is directed to a circulating dry scrubber (CDS) dry flue gas desulfurization (DFGD) system operable using a lime slurry supply, to process a gas stream.BACKGROUND[0003]In the processing or treatment of flue gases or gas streams, dry flue gas desulfurization (DFGD) systems are known. In DFGD processes, lime (CaO) is first converted to hydrated lime (Ca(OH)2) before contact with the flue gas. The hydrated lime contacts the flue gas as a dry or moistened powder in a circulating dry scr...

Claims

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Application Information

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IPC IPC(8): B01D53/50
CPCB01D53/508B01D2259/128
Inventor FIEDLER, MARK ALBERT
Owner GENERAL ELECTRIC TECH GMBH
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